72257320 has 32 divisors (see below), whose sum is σ = 164413800. Its totient is φ = 28576768.

The previous prime is 72257303. The next prime is 72257333. The reversal of 72257320 is 2375227.

It can be written as a sum of positive squares in 4 ways, for example, as 46430596 + 25826724 = 6814^2 + 5082^2 .

It is a super-2 number, since 2×72257320² = 10442240587164800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6589 + ... + 13708.

Almost surely, 2^72257320 is an apocalyptic number.

It is an amenable number.

72257320 is an abundant number, since it is smaller than the sum of its proper divisors (92156480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72257320 is a wasteful number, since it uses less digits than its factorization.

72257320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20397 (or 20393 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 72257320 is about 8500.4305773296. The cubic root of 72257320 is about 416.5117746052.

The spelling of 72257320 in words is "seventy-two million, two hundred fifty-seven thousand, three hundred twenty".